Command Access PS204/204B Line...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$400.00
$292.67
Command Access Command Access PS204/204B UL 6E/CSA Linear with 2 Amps at 24VDC Power Supply CAT PS204/204B

Command Access PS204/204B Linear Power Supply with 2A at 24VDC and Battery Backup

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Model: PS204B

In Stock (leaves warehouse same day if ordered before 3pm ET)

$400.00
$292.67
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Command Access PS204/204B Linear Power Supply with 2A at 24VDC and Battery Backup

Professional Linear Power Supply for Access Control Systems

The Command Access PS204/204B is a UL 6E/CSA certified linear power supply designed for commercial access control applications. This 120VAC input unit delivers 2 amps at 24VDC through 4 PTC fused outputs with solid-state input triggers that protect system relays from shorts, grounds, and surges. Available in two enclosure sizes - PS204 (11" W x 11" H x 4" D) and PS204B (13" W x 15.5" H x 5" D) - with the PS204B model accommodating dual 12VDC 7AH batteries for backup power.

Professional Features & Benefits

  • Linear Design Performance: Linear design ensures ample inrush/hold current for reliable latch retraction in electric locks, motor-driven exit devices, electric strikes, and mag locks.
  • Multiple Output Protection: 4 solid-state I/O channels with 0.75A auto-resetting fused outputs provide individual circuit protection and intelligent short circuit detection.
  • Comprehensive Battery Backup: Regulated, independent battery charging with automatic uninterrupted backup circuit supports dual 12VDC 7AH batteries (batteries not included, cables included).
  • Visual Status Monitoring: LED indicators provide clear system status - Red for AC Power, Green for DC Output, and Orange for Battery Output, plus door-mounted LED power indicator.
  • Fire Alarm Integration: Built-in fire alarm link for emergency system coordination and code compliance applications.
  • Professional Installation Features: Easy-to-remove euro connectors, 1/2" and 3/4" knockouts on all sides, and hinge-less removable cover for simplified installation and maintenance.
  • Robust Environmental Rating: Operating temperature range of 0 to 49°C (32 to 120°F) with maximum humidity tolerance of 85% for reliable performance in various commercial environments.
  • Dual Enclosure Options: PS204 (10 lbs) for standard applications and PS204B (14 lbs) for battery backup requirements with flexible mounting configurations.

Technical Specifications

  • Commercial/Residential: Commercial
  • Current: 2A
  • Department: Door Hardware
  • Product Category: Electronic Access Controls
  • Product Group: Electronic Access Controls
  • Product Subgroup: Power Supplies
  • Product Type: Power Supplies
  • Product Voltage: 2A @ 24VDC
  • Series: PS204/204B Series
  • Subcategory: Power Supply

Professional Applications

  • Commercial Building Access Control Systems
  • Educational Facility Security Infrastructure
  • Healthcare Institution Electronic Lock Systems
  • Industrial Facility Access Point Control
  • Multi-Tenant Residential Electronic Security
  • Government and Municipal Building Access Systems
  • Emergency Exit Compliance and Fire Alarm Integration

Why Choose Command Access Quality?

Command Access PS204/204B power supplies deliver professional-grade reliability with UL 6E/CSA certification and linear design rated for demanding commercial access control applications. The intelligent short circuit detection and regulated battery backup system ensure uninterrupted operation when dependable performance is essential. Engineered with robust environmental ratings and comprehensive protection features for long-term commercial installation reliability.

Manufacturer Resources

Command Access Catalog

Product Specs

Product Group:
Electronic Access Controls
Series:
PS204/204B Series
Subcategory:
Power Supply
Commercial/Residential:
Commercial
Product Type:
Power Supplies
Product Subgroup:
Power Supplies
Current:
2A
Product Voltage:
2A @ 24VDC
Product Category:
Electronic Access Controls
Department:
Door Hardware

Command Access PS204B – Frequently Asked Questions

1) Do the batteries come with the Command Access PS204B?
No. The PS204B ships with the battery cables but the two 12VDC 7AH batteries are not included, so budget those separately. The board handles the charging itself, with regulated independent battery charging and an automatic uninterrupted backup circuit, so nothing else is needed between the supply and the batteries.
2) How many doors can the Command Access PS204 power?
Four, hardware-wise: the PS204/204B has 4 solid-state I/O channels, each with its own 0.75A auto-resetting fuse and short circuit detection, so one shorted device does not take down the other three. The real limit is current, not channels. Everything on the board shares a single 2A at 24VDC budget, so add up the hold current of your locks first. Four low-draw electric strikes fit comfortably; four motorized latch retraction devices pulling inrush together do not.
3) Can I tie the Command Access PS204 into the building fire alarm so the mag locks release?
Yes, there is a built-in fire alarm link on the PS204/204B for exactly that. It lets the supply drop power to the locks on an alarm signal from the FACP, which is what your AHJ will be looking for on any mag lock or fail-safe electric lock installation. The unit itself is UL 6E/CSA certified.
4) I need more than 2 amps at 24VDC for a bank of mag locks - what should I use instead?
The PS204/204B tops out at 2A at 24VDC across its 4 fused outputs, so a large mag lock or strike bank will outrun it. The Altronix AL1024ULACMCB is a power supply and access power controller with 115VAC 60Hz input at 4.2A, 8 PTC outputs, and 24VDC at 10A. The BEST PS161-6 is a 120V input, 12/24V output supply with 6A capacity built for delayed egress exit devices. The SDC 634 Series is a 4 amp regulated and filtered low voltage supply with dual voltage selection. Size the supply to the total inrush and hold draw of every device on the circuit, not the count of doors.
5) Is a switching power supply the same as the Command Access PS204 linear supply?
They are different designs. The PS204/204B is a linear supply, and the linear design is what gives it the inrush and hold current for latch retraction in electric locks, motor driven exit devices, electric strikes, and mag locks. The Securitron AQD1, AQL4, and AQS1210 are switching supplies - the AQL4 at 12/24VDC 4/3 amp and the AQS1210 at 12 VDC 10 amp. A switching unit can carry a higher continuous rating and still behave differently on the inrush spike a motorized latch retraction device draws, so check the device manufacturer's inrush requirement before swapping design types.
6) Is the Command Access PS204 UL listed for commercial access control?
UL 6E and CSA certified, and it is a commercial-rated unit rather than a residential plug-in transformer. That is the pairing a spec writer or facility inspector wants to see on an access control supply feeding electric locks and mag locks.
7) Should I use a linear power supply or a switching supply for electric latch retraction?
Linear, when latch retraction is in the mix. A switching supply regulates tightly but can fold back or trip on the brief high inrush a retraction motor pulls; a linear supply like the PS204/204B carries the inrush and hold current through. That is the stated reason for its design, and why it covers motor-driven exit devices as well as strikes and mag locks. Switching units make more sense on steady low-draw loads: the Securitron AQL4 (12/24VDC, 4/3 amp) and AQD1 (12/24 VDC, 1 amp) are switching supplies if that is your load profile.
8) What do I use to power motorized latch retraction exit devices instead of a general purpose supply?
The PS204/204B is a linear supply and its design supports latch retraction on motor driven exit devices at 2A 24VDC. Where the exit device manufacturer calls for a dedicated retraction supply, the BEST RPSMLR2 Series is built specifically for motorized latch retraction exit devices, and the BEST ELR150 Series is a power supply control module for electronic access control. On a delayed egress opening, the BEST PS161-6 is the supply intended for delayed egress exit devices, with 120V input and 12/24V output at 6A. Match the supply to what the exit device manufacturer specifies for its retraction motor.
9) What is a smaller power supply than the PS204 for a single electric strike?
For one opening the 2A at 24VDC of the PS204/204B is more capacity than a single strike needs. The SDC 620 Series is a 1 amp regulated and filtered low voltage supply with dual voltage selection, and the SDC 631 Series is a 1.5 amp regulated and filtered DC power controller, also dual voltage. The Securitron AQD1 is a switching supply at 12/24 VDC 1 amp. The Adams Rite PS-1 is a regulated 1 amp 12/24 volt DC supply with battery backup, which is the smaller option that still carries backup. The ROFU 9126T is a plug in mini supply at 12VDC 1.5A with time delay.
10) Which power supplies besides the Command Access PS204B include battery backup?
The PS204B enclosure accommodates dual 12VDC 7AH batteries with regulated independent charging and an automatic uninterrupted backup circuit; batteries are not included and cables are. Among the peers, the Adams Rite PS-1 is a regulated 1 amp 12/24 volt DC supply with battery backup, and the Detex 10-800 Series is a universal logic controller with a 120VAC/24VDC supply and battery backup. The Detex unit combines logic control with the supply rather than serving as a standalone supply, so it fits a different scope of work.
11) Will an Aiphone AC-PS1250 work in place of the Command Access PS204?
Not for 24VDC hardware. The Aiphone AC-PS1250 is a 12V DC 5A UL listed supply for AC Series access control kits, so it delivers a different output voltage than the PS204/204B, which is 2A at 24VDC. If the locks, strikes, or mag locks on the opening are 24VDC devices, a 12V only supply cannot drive them. The peers that cross both voltages are the Von Duprin PS902 at 2A 12/24 VDC field selectable and the RCI DKPS-2A at 12/24VDC 2A.
12) Is a ROFU power transfer hinge an alternative to the PS204 power supply?
No. The ROFU 10305-LA/10306-LA is a tamper resistant power transfer hinge rated 1.5A at 42V in a plastic white finish - it carries power across the door edge to the lock and does not generate it. The PS204/204B is the source, converting 120VAC input to 2A at 24VDC across 4 fused outputs. On an electrified opening you typically need both: a supply at the panel and a transfer device at the hinge. The ROFU 9102-12D UL/9102-24D is the ROFU supply, taking 10/120VAC 60Hz input.
13) Does any comparable power supply offer more individually protected outputs than the PS204?
The PS204/204B provides 4 PTC fused outputs, each with a 0.75A auto resetting fuse and intelligent short circuit detection. Two peers carry more output circuits: the RCI DKPS-2A has 8 outputs at 12/24VDC 2A, and the Altronix AL1024ULACMCB has 8 PTC outputs at 24VDC 10A. More outputs means more doors fed from one enclosure without adding a distribution board, which matters when a single riser closet serves a corridor of openings.
14) What if there is no AC power at the opening - is there an alternative to the PS204?
The PS204/204B needs a 120VAC input to produce its 2A at 24VDC. Where no line power reaches the location, the Securitron BPSS is a boxed solar power supply, which sources its own power rather than tapping a branch circuit. That is a different installation entirely - it needs sun exposure and a mounting location for the panel - so it suits remote gates and outbuildings rather than an interior riser closet where the PS204/204B normally lives.
15) How do I know if the Command Access PS204 is running on battery or on AC?
Read the LEDs. Red means AC power present, green means DC output, and orange means the unit is running off battery output. There is also a door-mounted LED power indicator, so you can confirm the supply is alive without opening the enclosure on a walk-through. If you see orange with no red, the branch circuit feeding that closet is down.
16) How does the Command Access PS204 enclosure get mounted and wired into conduit?
The box has 1/2" and 3/4" knockouts on all sides, so you can bring conduit in from whichever direction the wall or closet gives you. The cover is hinge-less and removable, which matters in a tight electrical room where a swinging door has nowhere to go, and the field terminations use euro-style pluggable connectors so you can pull the connector rather than re-landing every conductor during service.
17) Can the Command Access PS204 be installed in an unconditioned mechanical room or parking structure?
Operating range is 0 to 49 degrees C (32 to 120 F) with humidity up to 85 percent. That covers a warm mechanical room or an interior parking level, but it does not cover a location that drops below freezing or sees direct weather. Unheated garages in a cold climate and exterior walls are out; use a conditioned closet or a heated enclosure.
18) What happens to the Command Access PS204 outputs if an installer shorts a lock wire?
Each of the 4 outputs is protected by a 0.75A auto-resetting PTC fuse with intelligent short circuit detection, and the solid-state input triggers shield the system relays from shorts, grounds, and surges. A short trips only the affected channel and it resets itself once the fault clears, so there is no fuse to replace and the other three openings keep working while you chase the problem.
19) For a facility standard, which access control power supply carries a stated grade?
Of the comparable supplies, the Von Duprin PS902 base power supply is the one that carries a Grade 1 designation, at 2A 12/24 VDC field selectable. The Command Access PS204/204B is UL 6E/CSA certified and includes a built in fire alarm link for emergency system coordination, which is the certification and code coordination point a specifier usually needs on an access control supply. Grade designations are more commonly written against mechanical hardware than against power supplies, so a facility standard for supplies generally reads on listings and output rating.
How fast can I get the Command Access PS204B delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Command Access PS204B come with a warranty?
Absolutely. The Command Access PS204B is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Command Access PS204B?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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